I was trying to explain to my 16 year old daughter what it feels like... mine start somewhere in the chest region, and I can feel it spreading to my neck and head, a bit like a kettle slowly coming to the boil, sort of inside me - remember those old kettles that used to whistle when they reached boiling point! That's what mine feel like, I'm literally at boiling point for between 2 to 5 minutes, my skin is immediately damp, but weirdly although I am boiling on the inside, I am cold on the outside, it's such a strange sensation, as well as being acutely uncomfortable, and my hairline always ****les with sweat.. the fan goes on at work, and I fling open the windows. Then it passes, and I am left with damp clothes, and am shivering with cold - lovely!